[PD] Error Compiling Gem on Ubuntu 15.04

[Jim Ruxton]

I am getting the following errors in compiling Gem on Ubuntu 15.04. Any 
thought on what I need to do to correct this. Thanks.

Jim
cordV4L2.cpp:81:5: error: '::close' has not been declared
      ::close(m_fd);
      ^
recordV4L2.cpp: In member function 'virtual bool 
gem::plugins::recordV4L2::open(std::string)':
recordV4L2.cpp:101:65: warning: format '%s' expects a matching 'char*' 
argument [-Wformat=]
      verbose(1, "device '%s' is not a video4linux2 output device");
                                                                  ^
recordV4L2.cpp: In member function 'virtual bool 
gem::plugins::recordV4L2::init(const imageStruct*, int)':
recordV4L2.cpp:159:3: error: '::write' has not been declared
    ::write(m_fd, m_image.data, m_image.xsize*m_image.ysize*m_image.csize);
    ^
recordV4L2.cpp: In member function 'virtual bool 
gem::plugins::recordV4L2::putFrame(imageStruct*)':
recordV4L2.cpp:184:3: error: '::write' has not been declared
    ::write(m_fd, m_image.data, size);
    ^
Makefile:471: recipe for target 'gem_recordV4L2_la-recordV4L2.lo' failed
make[2]: *** [gem_recordV4L2_la-recordV4L2.lo] Error 1
make[2]: Leaving directory 
'/home/jim/Downloads/Gem-0.93.3/plugins/recordV4L2'
Makefile:390: recipe for target 'all-recursive' failed
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory '/home/jim/Downloads/Gem-0.93.3/plugins'
Makefile:485: recipe for target 'all-recursive' failed
make: *** [all-recursive] Error 1